| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new low-viscosity aqueous pigment dispersion, having a low yield point and good in dispersion and storage stabilities by blending a pigment with a pigment dispersing agent and water and further water-insoluble solid fine particles. SOLUTION: This aqueous pigment dispersion consists essentially of (A) a pigment (preferably having 0.1-1μm average particle diameter measured by a centrifugal sedimentation method, etc.), (B) a pigment dispersing agent (e.g. a water-soluble amino resin or an alkyd resin), (C) water-soluble solid fine particles and (D) water (preferably deionized water). The component (C) is inorganic fine solid particles having <=50mg/l solubility in water at 20 deg.C and the average particle diameter of (1/2) to (1/20) that of the component (A) and preferably fine particles capable of providing a transparent dispersion having >=90% total light transmittance when dispersing the fine particles at 50wt.% concentration in water. For example, fine titanium oxide particles, etc., are concretely cited. Furthermore, the amounts of the components used are preferably 10-70wt.% component (A) based on the dispersion, 1-3wt.% component (B) based on the component (A) and 5-250 pts.wt. component (C) based on 100 pts.wt. component (A).
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